The Ottoman Empire in this period:. a. also sought an empire in east Asia.
b. made concessions to Europeans.
c. continued its conquests in Europe.
d. none of the above.

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.

some american cities felt workers were being oppressed by business monopolies

a system of cooperative federalism emerged, as the powers of the federal government expanded.

immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers